First of all, I am not sure what you mean by "international business". The number of possible careers that you could mean by this is huge! So many things fall under international business depending on how you look at it. That being said, it is possible to get any of the jobs that may be deemed "international business" if you apply yourself and work really hard.
International business is a very exciting field, but as Andrea said, it is a broad category. I would encourage you to read as much current world history, say perhaps post WWII. Try to increase your cultural understanding of a particular region you are interested in work in. See if your school has a foreign business students group made up of foreign students. Try to learn from them. I have sold a lot of different products in a variety of international markets. I have found that the key to successful international sales is to build trust and cultural respect. If you are interested in international sales, take some products that you like here in the US and start studying how they are sold in markets you are interested in....study the packaging...see how it comes to USA packaging. Use Google Translate (if there is a language issue) and see what are the selling points that are stressed differently in overseas markets. If you can, try to travel....Hope this helps and good luck with your studies and career. This is a great field.
Can I assume that you are in university? If so, I would suggest that you beef up your major in international business with classes in finance, statistics and data analysis / analytics, accounting. Building a toolkit of quantitative, analytical skills will serve you well in just about any career. You may consider a minor in one of these fields or simply take a sufficient number of classes to have a good grasp of the basics. International business is a general enough major that you will be able to find A job. The question is what kind of job do you want to have? To answer your question, it would be helpful to know more about you, your educational background, and your interests. Consider including this information in future postings.